第1話: 直江力希が時津小夜と出会い、彼女から学校内の秘密の宝を探し出すよう誘われる

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While Riki Naoe goes to the classroom to pick up a Japanese lit notebook at nighttime, he is approached by Saya Tokido, who urges him to flee. After he hears a distant gunshot, he finds her abandoned student handbook left in the classroom. On the next day, Riki returns the student handbook back to Saya, who invites him on the school roof. She claims that the "Darkness Executives" may capture and interrogate him and may discover her identity. When Saya pushes Riki off the school roof, Masato Inohara appears outside below. Riki faithfully lets go of the ledge and has Masato catch him. Soon inquiring Kyousuke Natsume about the Darkness Executives, Riki is warned not to get involved with them. After Kengo Miyazawa saves Riki from a noose, Riki later escapes an overhead power line conducted by saltwater balloons. Saya finds Riki interesting for dodging her traps and enlists his help instead, revealing that her mission is to locate a "secret treasure" inside the school. Spotting a mysterious contraption inside a classroom, Riki and Saya manage to activate it and a secret entrance is revealed. They flee into the secret entrance before being chased by the Darkness Executives. (Source: Wikipedia)